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Title: Mobility transition at grain boundaries in two-step sintered 8 mol% yttria-stabilized zirconia

Authors:
 [1]; ORCiD logo [1]
  1. Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia Pennsylvania
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1412599
Grant/Contract Number:
DEFG02-11ER46814
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Journal of the American Ceramic Society
Additional Journal Information:
Related Information: CHORUS Timestamp: 2017-12-11 06:49:05; Journal ID: ISSN 0002-7820
Publisher:
Wiley-Blackwell
Country of Publication:
United States
Language:
English

Citation Formats

Dong, Yanhao, and Chen, I-Wei. Mobility transition at grain boundaries in two-step sintered 8 mol% yttria-stabilized zirconia. United States: N. p., 2017. Web. doi:10.1111/jace.15362.
Dong, Yanhao, & Chen, I-Wei. Mobility transition at grain boundaries in two-step sintered 8 mol% yttria-stabilized zirconia. United States. doi:10.1111/jace.15362.
Dong, Yanhao, and Chen, I-Wei. 2017. "Mobility transition at grain boundaries in two-step sintered 8 mol% yttria-stabilized zirconia". United States. doi:10.1111/jace.15362.
@article{osti_1412599,
title = {Mobility transition at grain boundaries in two-step sintered 8 mol% yttria-stabilized zirconia},
author = {Dong, Yanhao and Chen, I-Wei},
abstractNote = {},
doi = {10.1111/jace.15362},
journal = {Journal of the American Ceramic Society},
number = ,
volume = ,
place = {United States},
year = 2017,
month =
}

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on December 11, 2018
Publisher's Accepted Manuscript

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  • Grain-boundary plane, misorientation angle, grain size, and grain-boundary energy distributions were quantified using electron backscatter diffraction data for dense polycrystalline yttria-stabilized zirconia, to understand interfacial crystallography in solid oxide fuel cells. Tape-cast samples were sintered at 14501C for 4 h and annealed for at least 100 h between 8001C and 16501C. Distributions obtained from both three-dimensional (3D) reconstructions and stereological analyses of 2D sections demonstrated that the (100) boundary planes {(111)} have relative areas larger {smaller} than expected in a random distribution, and that the boundary plane distribution is inversely correlated to the boundary energy distribution.
  • The dependence of grain-boundary resistivity and resistance per square centimeter of grain-boundary surface on grain-boundary density (D) in yttria-stabilized zirconia was investigated using reported data. The grain-boundary resistivity increased with increasing D in the high-D region but was independent of D in the low-D region. These results were interpreted in terms of intrinsic effects such as lattice irregularity and extrinsic effects such as impurity segregation. 13 references.
  • We present a new interatomic potential capable of describing the cubic and tetragonal phases of zirconia. From an analysis of molecular-dynamics simulations of the structural fluctuations in the cubic phase close to the transition temperature, we show that the cubic-to-tetragonal transition is displacive. In addition, the discontinuous change in volume and the latent heat at the transition demonstrate clearly that the transition is first order. The model correctly predicts that doping with yttria tends to stabilize the cubic phase at lower temperatures. A description of the first-order nature of dopant-driven transitions is given.
  • Superplasticity has been observed in several different fine-grained ceramics including yttria-containing tetragonal zirconia polycrystals (Y-TZPs). Evidence for superplasticity in these materials has been obtained both indirectly from compression tests as well as directly from tension tests. A tensile elongation-to-failure of over 800% has now been recorded for a ZrO{sub 2}-5.2wt.%Y{sub 2}O{sub 3} material. Despite the fact that Y-TZPs can exhibit large strains to failure, the exact deformation mechanisms responsible for this behavior are still controversial. The authors discuss how, in order to gain further insight into mechanisms responsible for large tensile elongations, several investigators have attempted to measure the strainmore » rate sensitivity of Y-TZPs at different temperatures.« less
  • Grain growth kinetics for 8 mol% yttria stabilized cubic zirconia (8Y-CSZ) were investigated. Optimal process parameters required to achieve a small grain size and full density for cubic 8Y-CSZ included a rapid heating rate (100 C/min) and hot isostatic pressing. Grain growth rates could also be controlled by the deliberate addition of 1 wt% of intergranular phases of borosilicate, barium silicate, and lithium aluminum silicate glasses. Lithium aluminum silicate, the intergranular phase with the highest solubility for yttria and zirconia, enhanced grain growth compared to control samples without grain boundary phases. The borosilicate intergranular phase, with the lowest solubility formore » yttria and zirconia, was the most effective in suppressing grain growth. Activation energies for grain growth were in the range of 400 kJ/mol, and the grain growth exponent ranged from 2 for lithium aluminum silicate containing samples, to 3 for pure samples, to 4 for barium silicate and borosilicate containing samples.« less